5 OPERATION
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5.3 Connection of welding and return cable
The power source has two outputs, a positive terminal (+) and a negative terminal (-), for
connecting welding and return cables. The output to which the welding cable is connected
depends on the type of electrode used. The connecting polarity is stated on the electrode
packaging. Connect the welding cable to the terminal stated on the electrode packaging.
Connect the return cable to the other output on the power source. Secure the return cable's
contact clamp to the work piece and ensure that there is good contact between the work
piece and the output for the return cable on the power source.
5.4 Overheating protection
The welding power source has a thermal overload trip which operates if the temperature
becomes too high, interrupting the welding current and lighting a yellow indicating lamp on
the front of the power source. The thermal overload trip resets automatically when the
temperature has fallen.
5.5 MMA welding
Arc 151i / 201i gives direct current, and you can weld most metals to alloy and non- alloy
steel, stainless steel and cast iron.
Arc 151i / 201i allows you to weld most coated electrodes from Ø 1.6 mm to Ø 3.25 mm.
MMA welding may also be referred to as welding with coated electrodes. Striking the arc
melts the electrode, and its coating forms protective slag.
If, when striking arc, the tip of the electrode is pressed against the metal, it immediately melts
and sticks to the metal, rendering continued welding impossible.
Therefore, the arc has to be struck in the same way that you would light a match.
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